Method for reclaiming rare noble metals from waste circuit board

A technology for waste circuit boards and rare and precious metals, applied in the direction of improving process efficiency, can solve the problems of incomplete separation and recovery, low recovery rate of palladium, etc., and achieve the effects of high recovery rate, environmental friendliness and simple operation.

Active Publication Date: 2011-09-14
JIANGXI GREEN ECO MFG RESOURCE CYCLE
View PDF3 Cites 43 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lead-containing by-product Na in this method 2 PbO 3 and aluminum-containing by-product Na 2 AlO 3 , antimony by-product Na 2 SbO 3 It is equal to the mixed crystallization in the same step, which has not been completely separated and recovered
In addition, the method of recovering metallic silver in this method i

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0032] Example one

[0033] A method for recovering rare and precious metals from waste circuit boards, including the following steps:

[0034] (1) Crushing and electrostatic sorting: take waste circuit boards, clean, dry, rough break, eddy current sorting, fine breakage and electrostatic sorting, remove rubber and plastic materials, and obtain metal-rich collective powder.

[0035] (2) Calcining: take the metal-rich aggregate powder described in step (1) and calcinate at 500° C. for 2 hours to obtain the calcined material.

[0036] (3) Extraction of copper and aluminum by acid leaching: take the calcined material in step (2), add 3mol / L sulfuric acid to extract copper and aluminum, adjust the pH to 1.5, filter and separate the solid and liquid to obtain a copper and aluminum-containing leaching solution and Acid leaching filter residue, the acid leaching filter residue enters step (4).

[0037] Separate copper and aluminum for the first time: take the leaching solution containing copp...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method for reclaiming rare noble metals from a waste circuit board. The method comprises the following steps of: crushing, performing electrostatic separation, calcining, performing acid leaching, and extracting silver, gold, platinum and palladium respectively. The method can realize maximization of valuable metal resource recycle, can reclaim various rare noble metals respectively, and is high in recovery rate, simple in operation of the reclaiming process, low in energy consumption and environment-friendly.

Description

technical field [0001] The invention relates to the treatment of industrial waste, in particular to a method for recovering rare and precious metals from waste circuit boards. Background technique [0002] With the improvement of people's living standards, the frequency of replacement of various household appliances is getting higher and higher, and the amount of waste circuit boards (PCBs) produced by various waste household appliances is increasing. If these waste circuit boards are directly discarded, it will not only occupy a large amount of land resources, but also cause a waste of valuable metal resources, and various toxic and harmful substances such as polyvinyl chloride and halogenated flame retardants contained in them will have harmful effects on the surrounding environment. produce huge pollution. On the other hand, the electronic components on the circuit board contain precious metals such as gold, palladium, platinum, silver, and rare metals such as tantalum, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C22B7/00C22B1/00C22B3/04C22B11/00C22B13/00C22B15/00C22B21/00C22B30/02
CPCY02P10/20
Inventor 许开华谭翠丽
Owner JIANGXI GREEN ECO MFG RESOURCE CYCLE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap